[sdiy] I2C DAC

MTG grant at musictechnologiesgroup.com
Sat Jun 19 23:25:37 CEST 2010

In only have two pins and I can definitely bit-bang, but there is also 
hardware support for I2C (though I don'tyet know if I can assign the I2C to 
the pins I have left). I don't think I can pull off SPI with only two pins. 
Most chips I've seen need a Chip Select signal.


----- Original Message ----- 
From: "Tim Ressel" <madhun2001 at yahoo.com>
To: "MTG" <grant at musictechnologiesgroup.com>; <Synth-diy at dropmix.xs4all.nl>
Sent: Saturday, June 19, 2010 2:16 PM
Subject: Re: [sdiy] I2C DAC

> GB,
> Do you need I2C, or are you just bit-banging? Microchip has some 
> inexpensive 12-bit DACs:
> http://ww1.microchip.com/downloads/en/DeviceDoc/22248a.pdf
> Available at Digikey.
> --Tim (pinching pennies 'til Lincoln screams) Ressel
> ----- Original Message ----
> From: MTG <grant at musictechnologiesgroup.com>
> To: Synth-diy at dropmix.xs4all.nl
> Sent: Sat, June 19, 2010 2:09:41 PM
> Subject: [sdiy] I2C DAC
> I'm almost out of pins, but I have two left in a project that I want to 
> hook a DAC up to for control voltages. Anyone recommend a decent I2C 
> single or multi-channel 0 to 5v voltage out DAC?  What are most people 
> using for resolution of control voltages these days? I know 7-bits was the 
> standard for a long time. Is it worthwhile looking at higher resolution 
> for things like filter cutoff or pitch bend or ... ?
> GB
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